Sustainable markup and annotation of 3D geometry

We propose a novel general method to enrich ordinary 3D models with semantic information. Based on the Collada format this approach fits perfectly into the XML world: It allows bi-directional linking, from a web resource to a (part of) a 3D model, and the reverse direction as well. We also describe our software framework prototype for 3D-annotation by non-3D-specialists, in our case cultural heritage professionals.